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GCSE Design and Technology · key term
A semiconductor component that emits light when current flows through it in the forward direction.
Used by Edexcel
Specification 5.2.3 · Paper 1
Revise: Output DevicesBuzzers and loudspeakers produce sound, LEDs produce light, and motors produce movement. Choosing between them means considering what the user needs the product to do, not simply whether the component can be switched on.
Give a relevant limitation as well as an advantage. For example, an LED provides a low-power visual indication, but it cannot attract attention if the user is not looking at it.
An LED needs the correct polarity and current limiting. A motor may need a driver circuit because a microcontroller cannot supply enough current directly.
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